NDS 999S 9" Square Catch Basin Grate - Sand, UV-Stable HDPE

The NDS 999S 9" square catch basin grate in Sand provides a lightweight, maintenance-free cover option to keep leaves and debris out of your drainage system. Made to work with the NDS 9" x 9" catch basin series, this grate combines UV-treated polymer durability with a clean, low-profile appearance that blends into landscaped and hardscaped areas.

• Material & finish: UV-stable HDPE / structural foam polyolefin for long-term outdoor resistance to fading, cracking, and corrosion.
• Exact fit: Designed to fit NDS 9" x 9" catch basins, risers, and low-profile adapters for quick, secure installation.
• Dimensions: Nominal 8-7/8" x 8-7/8" x 1-1/8" overall (fits 9" square opening).
• Hydraulic performance: Generous open surface area (approx. 39.50 sq in) with a flow capacity around 51.75 GPM under 1/2" head, keeping surface water moving efficiently.
• Applications: Ideal for lawns, landscaped areas, under downspouts, patios, walkways, and other pedestrian zones where reliable surface drainage and low visual impact are needed.

Lightweight and rustproof, the 999S installs easily and requires minimal maintenance—periodic debris removal is typically all that’s needed. For engineering, vehicular-load recommendations, or ADA and code questions, refer to the NDS technical datasheets and load-rating documentation to confirm suitability for specific project conditions.